Tone arm



Patented .luly 17, 1923.

unirse STATES FRANK oBERsT, or GLENDALE, NEWYORK, AssrGNoR yTo SONORA PHoNoGRAPHcoR- PoRA'rIoN, acoRroRnTIoN or NEW YORK. y

Lamis PATENT ore-fics.

TONE ARM. l

- appncannniediune 12, 1919. serial 110.303,614.

To all cli/wm t may concern l Be it known that I, FRANK GEEKST, a sub` ject of the Kingdom of Rumania,` and residing at Glendale, in the borough of Queens, county of Queens, and State of New York, have invented a certain new and useful improvement in Tone Arms, of which the following is a specification.

My invention relates to tone-arms for talking machines, and hasfor its objects to provide a tone-arm of fibrous material, having a oint whereby the arm may lbe low# ered to engage the stylus with the record disc, and whereby the arm may be elevated in orde-r that the stylus will be 4accessible for insertion or removal.`

A further Objectis to produce a tone-arm of the character described, in whichithe sound passage will be unobstructed.

A. still further object is to provide means for locking the arm in inoperative position by devices which will be entirely disengaged when the arm is in operative position,

ywhereby rattling and other objectionabl sounds will be obviated.

A further object of ythe invention is to provide means of the character herein dei scribed, simple in construction, thoroughly reliable and efficient in its purpose,-'posi tive in operation and inexpensive to manu-` facture. w l f iVith these and other objects invieyw to be more fully set forth hereinafter, the invention consists in thenovel" construction, combination of elements, andlarrangement of parts which will be exemplified in the construction hereinafter described inthe specil fication and illustrated in the accompanying drawings considered together or separately.

The inventive idea involved isc'apa'blefof receiving `a variety of mechanical *expressions, one of which for the purpose 'of illustrating the invention, is shown in the accompanying drawings. y H

rrIhe invention will be first described in connection with thezaccompanying drawings illustrating one embodiment of my invention, wherein similar reference characters are used to designate corresponding parts throughout the several views, and then more specifically defined and indicated infthe appended claims. f

1n the drawings Fig. 1 is a longitudinal section of a tonearm embodying my invention; and

F ig. 2 is a bottom plan view ofthe movi able element of the armand a` co-operating device carried bythe stationary member of the arm. i

ln carrying out my invention7 I provide a stationary sound post 1 which communicates with the horn or amplifier of a talking machine. The tubular 1, composed of wood or `other fibrous material, is secured to the'top of a motor board@ Ato the ,l under side of which `a motor (not shown) is secured. The motor is adapted 'to rotate'rthe usual turntable 3 whichcarries a record 4. Y

Fitted within the enlarged spherical free `extremity of the post `1 isa metallic sleeve 5 which preferably engages an enlargement of the bore ofthe post by friction. Within the sleeve'5` and carriedv on vertical pivotsfi is a spherical gimbal ring 7 in which is pivoted on horizontal pivots'8 a second 4spherf `carries a sound-'box or reproducer-1`5 of any preferred` type. TWithin the bore of the section 11 is a thimble 16 carrying al`pair'of oppositely` disposed pins 17 which engage curvedslots 18 in a sleeve 18a carriedfby the element 14, whereby the section and element may be locked together by an ordinary bayonet y joint. e v y The vertically pivoted and 'horizontally swinging 'gimbal ring 7 is provided withy an outwardly projecting lug 19 to` whichis secured anarm 19a to thelower end ,of which is' pivotally secured aviinger Q0 adapted to engage and operate an element of an automatic stop mechanism, not shown.

In the lower rini `of the cup12 is a slot 21, and fixed within Ithe slot'is a U shaped spring member 22, v,the legs Vof whichproject beyond the end of the slot."l The inner side: of each leg is provided withfa button or pin 28 adapted to engage the arm 19 when the section 11 is raised, as shown in full lines in Fglf' l erative position, as shown in Fig. 2,.a.nd in broken linesin Fig. 1theI need e, or` stylus yvvi'll res'tlwitlin the recordgroove'and beV held therein by the "vveight."oi the. 't'onearm. The legs of the spring will straddle the arm 19, and. said legs and the buttons carried thereby will beout of .Contact with.'

and beyond said arm, and during the playing of the record the section 11 will not vengage any 'ortion of the post l except the :pivots of t e gimbal rings. When the section l1 is swungupward to ,permitof changing ythe stylus, .the buttons 23 will engage one's'ide' oit the arm ,19,sp'read the legslfthe spring 22, and as the section reaches its ultimate-.height and released the buttons Will engage'the opposite' side of the arm, fas shownin full'ilines .in Fig. l, and the section thus retained in raised position. `There are no springs, catches, latches, pivots, rods or the like ivithin the bore oit the tone-arm, andthe sound? passage is at .all timesfree and unobstructed.

In accordance-With the provisions of the patentv statute, lI have described the prin.- Sciple of my'invention, together with the apparatus Whichlnoiv consider to represent thebesjt embodiment thereof, but I `desire it lIlllBI'StOOd 'that myinvntion is not limiteid to the"4 particular-form of apparatus hereinshown and described, as it is obvious that JChev `particular embodiment herein shown and descrfibed is only illustrative of my invention, ,and that other means can be employed to .obtain these .objects and ac- COInplish these" results, Without departing from the spirit of my invention. y

Having now described my` invention, what I claim and desire to secure by Letters Patent is :A f

.1. A tone-arm,` comprising a stationary tubular ypost member'termmating in lan enlarged end .having an annular spherical recess y,thereinfa tubular movable member having an enlarged spherical .cup-shaped endadapted `to .enter the. spherical recess in ,theend of the post member, and a gimb'al joint comprising independent"-members fixedin the bores' ofand `connecting jsaid tone-arm.. membersv at the enlarged' .ends thereof and concealed bythe overlapping ends ,of ysaid .tone-arm" mem-bers `Yand vrpermitting alhorizontal andvertical swinging ,movement iogf said `movable tone-arm mem- 2. A tone-arm, comprisingv a stationary tnbular `post memberhaving an enlarged sphericalrfend, a. tubular ,movable member ng' an enlarged spherical cup-shaped oyerlapping tie enlarged `spherical yend of the post member and provided with a slotl in its lower rim portion', a gimbal joint for connecting said members and comprising a horizontally swinging portion ``1Xed"in thebo'refof the post "member, and a vertically swinging portion iiXed in the bore of the movable member, an arm depending from and carried by the horizontally'svvingingportion of the gimbal joint and in alinement with the slot in the cupshaped end of the movable member, and a spring fixed `in said slot and carried by the movable member and provided ivith a stop or lug adapted to engage said arm to support the movable member of the tone arm lin an elevatedorinoperative position and to be yieldingly disengaged from said arm to permit the movable member to` asnune its operative position.

3. A tone-arm, comprising a stationary tubular post member, av tubular movable member having a slot at its inner end, a gimbal .joint -for connecting said members and `.comprising a horizontally swinging vportion fixed in the bore `of the'post member, and a vertically swinging portion fixed in the bore of the movable member, an arm depending from and carried bythe horizontally` swinging portion of the gimbal joint andl in alinement with the slot in the end of the movable member, and ya U- shaped spring lixed in said slot and straddling said arm and provided. with stops or lugs Aadapted to engage said arm to support the movable member in elevated or inoperative positionand to be yieldingly disengaged from said-arm to permit the movable member-to assume its Operative position. f

l. "A ,tone-arm, comprising a. stationary tubular post member, a tubular movable member, aT gimbal joint for connecting said members and ,comprising a f horizontally Stringing portion lined to the post meinber, vand la `vertically swinging portion ined to lthemovable member, an ar-m depending from and carried'b-y the horizontally swinging portion ,ot the gimbal joint, and a ,U- shaped springffixed .to the vertically movable member of the' tone-arm yand* strad- `dling said arm and provided with stops or lugsl adapted to engage said arm tov snpport the movable member in elevated'orfinoperative position and to be yieldingly `disengagedvfromsaid arm to permit: .the movable member to assume its operative position.`

This specification signed Vand witnessed thisth dayof ,J une, 1.91.9; g

I f FRANK @Bassr- E. H. JENNINGS. 

